FIG. 1.

Caseinolytic activity during growth of Photorhabdus sp. strain Az29 in TSBYE at different incubation temperatures. The bacterial growth was monitored by measuring the culture's optical density at 600 nm. Samples of culture supernatants were collected at different times, and the caseinolytic activity was estimated by using the macroassay described in Materials and Methods. The caseinolytic activity (μg/ml) is expressed in pronase E equivalent activity.